.link {
  stroke: black;
  stroke-width: 1px;
  stroke-opacity: 1.0;
}
.node circle {
  fill: #ccc;
  stroke: #fff;
  stroke-width: 1.5px;
}
.node-active circle{
  stroke: #555;
  stroke-width: 1.5px;
}
.link-active {
  stroke-opacity: 1;
}

.overlay {
  fill: none;
  pointer-events: all;
}
